THE KIAE-6 MULTISECTION HYBRID TYPE UNDULATOR

A description of a plane hybrid undulator contruction is presented. Th e undulator KIAE-6 consists of five sections each containing ten perio ds. The period length is 60 mm. SMCo5 permanent magnets are used as a magnetic flux source. The mechanical construction provides high accura cy of magnetic field periodicity (20 mum deviation limit). The gap has a vertical space orientation thus simplifying the problem of the gap distance change. The plane mechanical platforms supporting the undulat or sections have a special transmission for varying the gap in the ran ge from 15 to 45 mm. It means that the undulator field strength parame ter K can be easily changed within the range 0.5-2.6. A set of adjusti ng screws provides the possibility to accurately tune the magnetic fie ld amplitudes. The experimental results of the magnetic field measurem ents are presented, showing that the field amplitude spread is less th an 0.25%.